nonplussed, nonplussing
with obj.（一般作be nonplussed）surprise and confuse (someone) so much that they are unsure how to react使惊讶; 使迷惑：Diane was nonplussed by such an odd question.
黛安娜被这样一个古怪的问题给困惑住了。
- a state of being surprised and confused in this way惊讶; 迷惑; 困窘。
词源
late 16th cent.: from Latin non plus 'not more'. The noun originally meant 'a state in which no more can be said or done'.